Pantographic engraving-machine.



No. 771,573. PATENTED OCT. 4, 1904. A. POURLIER.

PANTOGRAPHIG ENGRAVING MACHINE.

APPLICATION FILED HOV.10,1902.

N0 MODEL. a SHEBTSSHIJET 1.

PATENTED OCT. 4, 1904.

A; POURLIER.

PANTOGRAPHIO ENGRAVING MAGHINE.

APPLICATION FILED NOV.10, 1902.

3 SHEETS-SHEET 2.

N0 MODEL.

PATENTED OCT. 4, 1904.

A. POURLIER. PANTOGRAPHIG ENGRAVING MACHINE.

APPLIUATION FILED NOV. 10, 1902.

3 SHEETS-SHEET 3.

N0 MODEL.

ire. 77am Patented October 4, 1904.

PATENT OFFICE.

ALBERT POURLIER, OF GOURNAY-EN-BRAY, FRANCE.

PANTOGRAPHIC ENGRAVING-MACHINE.

I SPECIFICATION forming part of Letters Patent No. 771,573, datedOctober 4, 1904.

Application filed November 10, 1902. $erial No. 130,792. (No model.)

To all Hill/077? it may concern:

Beit known that I, ALBERT POURLIER, manufacturer, a citizen of theRepublic of France, residing at Les Grands J ardins, at Gournayen-Bray,Seine-Infrieure, in the Republic of France, have invented certain newand useful Improvements in Pantographie Engraving- Machines, of whichthe following is a specification.

The invention includes the features hereinafter described, andparticularly pointed out in the claim.

Q In the accompanying drawings, which show one form in which myinvention can be carried out, Figure 1 is a front elevation of thereproducing-machine. Fig. 2 is a plan view of the same. Fig. 3 is aleft-hand side elevation of the machine, and Figs. 4 to 7 are detailviews of the machine.

The machine shown in Figs. 1 to 7 comprises a stock 4, provided with aplate 5, mounted to rotate with shaft 5 and on which is fixed a model inhard material 6. The plate or other article to be engraved, 7, is fixedin a mandrel 8 on shaft 8 of the stock 9.

The main frame 10 of the machine is provided with slideways 11, whichallow of fixing the stocks in different positions, according to thereduction desired. In front of the two stocks is located thebar-pantograph 12, provided with a carriage having a tracer 13 and witha carriage having a cutting device 14, intended to engrave the plate 7.The pantograph 12 is carried on one side by a support 15 by means of adouble knuckle 16 and 17 (see Fig. 6) and on the opposite side by acarriage 18, sliding on the support 19.

The machine is operated by means of either loose and fixed pulleys 20,mounted on the main driving-shaft 21, or of the treadle 22 through themedium of the pinions 23. The shaft 21 is also provided with a groovedpulley 24, which transmits the motion through an end less rope to theshaft 26 of the cutting or en graving device 14. The said rope passesover a series ofpulleys 28, 29, 30, 31, 28, and 27 so arranged that thetransmission is regulated according to the movement of the stock 9. Therope is kept under tension at all times by means of a spring 32, whichtends to move the pulleys 28 and 28 upward. The shaft 21 is alsoprovided with a conical drum 33, which transmits the motion by means ofa belt 59 to the conical drum 34, fixed on the intermediate shaft 35. Onthe said shaft are fixed two worms 36 and 37, which operate the wheels38 and 39 of the stocks 4 and 9. The shaft of stock 4 carries a pinion40, which operates a train of gear-wheels 41 42 43 44 45, the last threeof which are carried by a slidable support 46 and which serve totransmit the motion to a shaft 47, provided with two worms 48 and 49.The worm 48 operates the nut 50 of a screw 51, (see Fig. 7,) whichserves to produce the automatic descent of the pantograph-carriage 18.The return of the pantograph to its uppermost position is obtained bymeans of a hand-wheel 52, fixed to the screw 51.

The worm 49 operates a pinion 53, which .can be made to move with theshaft 54 by means of a clutch 55. (See Fig. 4.) Thesaid shaft 54operates, by means of the pinions 56, the screw 51, carrying a carriagehaving a fork 58, which moves the belt 59 on the conical drums 33 and 34when the machine is in op-- eration. (See Fig. A handwheel 60, fixed onthe shaft 54, serves to produce the rapid return of the belt 59. Forthat purpose the clutoh-sleeve 55, having been previously disconnectedand the drum 33 having been given a few revolutions, all that need bedone to move the belt as desired is to turn the fly-wheel 60 in theproper direction.

The result of the arrangements above described is that the tracer 13 iscaused to move downwardly as the screw 51 causes the carriage 18 to movedown and while the model is turning with the plate 5 under the operationof the worm 36. At the same time the engraving device 14, which is movedgeometrically the same as the tracer 13 and which turns under the actionof the endless rope 25, engraves the plate 7 while the latter is turningat the same speed as the model 6.

The rate of rotation of the model and the plate to be engraved isautomatically and progressively reduced as the engraving, begun at thecenter, moves farther toward the periphery through the instrumentalityof the automatic movement given to the belt 59 on the conical drums 33and 34:.

The automatic downward movement of the pantograph is at all timesproportional to the rotation of the shaft of stock 4:, so that the pitchof the helix or spiral line traced by the tracer 13 on the model 6remains the same at all times. It can be regulated by changing thegear-Wheels mounted on the support 46.

When it is desired to operate the machine by the foot, the belt-pulleysare put out of gear. On the other hand, when the machine is operated bythese belts the treadle is put out of gear.

Having thus described my invention, what I claim is In a machine of theclass described, the combination With the supporting frame or table, ofa pantograph-bar pivoted to swing in a vertical plane, a maindriving-shaft, a transverse shaft at the end of the table, variabledriving connections from the main driving-shaft to said transverseshaft, means whereby the rotation of said transverse shaft raises thefree end of the pantograph-bar, a worm on said transverse shaft, avertical shaft having a Wormwheel engaging said Worm, a belt-shifter forshifting said variable drive connections, a rotatable rod having athreaded portion engaging a correspondingly-threaded portion of saidbelt-shifter, and bevel-gears connecting said rod and vertical shaft,substantially as described.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing Witnesses.

ALBERT POURLIER.

Witnesses:

EDMOND BLETRY, MAURICE Roux.

